徐飞,姜汉桥,刘铭,王志强,于馥玮,曲世元,张媌,李俊键
XU Fei,JIANG Hanqiao,LIU Ming,WANG Zhiqiang,YU Fuwei,QU Shiyuan,ZHANG Miao,LI Junjian

• 1:油气资源与探测国家重点实验室
• 2:中国石油大学(北京)石油工程学院
• 3:中国石油勘探开发研究院
• 4:中国石油集团工程技术研究院有限公司

摘要(Abstract)：

为了研究低矿化度水驱中的黏土矿物在地层中的运移现象，利用可视化2.5D微观模型开展了微流控实验，研究了黏土矿物在运移过程中对扩大水驱波及体积的作用、黏土矿物的运移速度对运移距离的影响、黏土矿物对喉道的封堵作用类型和黏土矿物运移对油滴运移的影响等。实验发现：黏土矿物在运移时可封堵水流优势通道并显著增加水驱波及体积，从而提高原油的采收率；黏土矿物颗粒运移速度越快，越容易在短距离内产生对喉道的封堵，使得黏土矿物颗粒的运移距离越短。根据实验观察将黏土矿物颗粒对喉道的封堵分为3种类型，包括单颗粒封堵、并行颗粒封堵和堵后颗粒截留。黏土矿物对喉道的封堵主要受到喉道尺寸，黏土矿物颗粒的尺寸、数量及形状，流体的驱动力大小等因素的影响；黏土矿物颗粒会附着在油滴表面增加油滴运移的阻力，对喉道的封堵会改变油滴的运移路径和降低注入水对油滴的驱动力，不利于已波及区域油滴的运移。通过微流控实验明确的黏土矿物运移对喉道封堵和原油运移的影响，可为低矿化度水驱在矿场中的应用提供理论指导。
In order to study clay minerals migration in formation during low salinity water flooding, microfluidic experiment is carried out using visual 2.5D microfluidic model to study effect of clay minerals on expanding swept volume during low salinity water flooding, effect of migration rate of clay minerals on migration distance, types of clay minerals plugging on pore throats and effect of clay minerals migration on oil droplets migration. Experiment shows that clay minerals can plug dominant water flow channels and significantly increase swept volume of low salinity water flooding, thereby improving oil recovery. The faster the clay mineral particles migrate, the easier it is to cause throats plugging in a short distance, and the shorter the migration distance of clay mineral particles is. Based on lab observation, throats plugging by clay mineral particles is divided into 3 types including single particle plugging, parallel particles plugging and particles interception after plugging, and throats plugging by clay mineral particles is mainly affected by throat size, clay mineral particle size, quantity and shape, and fluid driving force. Clay mineral particles may adhere to oil droplets surface to increase the resistance of oil droplets migration, and throats plugging can change the migration path of oil droplets and reduce the driving force of injected water on oil droplets, which is not conducive to the migration of oil droplets in the swept area. Microfluidic experiment in this paper determines the influence of clay minerals migration on pore throats plugging and oil migration, providing theoretical guidance for field application of low salinity water flooding.

关键词(KeyWords)： 低矿化度水驱;黏土矿物;2.5D微观模型;封堵;提高采收率
low salinity water flooding;clay minerals;2.5D microscopic model;plugging;enhance oil recovery

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“页岩油气储层伴随相变多相微观流动规律与宏观渗流表征方法研究”（52174042）

作者(Author): 徐飞,姜汉桥,刘铭,王志强,于馥玮,曲世元,张媌,李俊键
XU Fei,JIANG Hanqiao,LIU Ming,WANG Zhiqiang,YU Fuwei,QU Shiyuan,ZHANG Miao,LI Junjian

DOI: 10.19597/j.issn.1000-3754.202204065

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